Although the structure of the mold may change from time to time due to the type and performance of the material of the injection mold, the shape and structure of the plastic product, and the type of the injection molding machine, the basic structure is the same. The mold consists mainly of a gating system, a temperature regulating system, a shaped part and a structural part, wherein the casting system and the molded part are in direct contact with the plastic, and the plastic and the product are changed. They are complex and diverse parts of the mold that require high machining accuracy and finishing precision.
In fact, the injection mold is composed of a movable mold and a fixed mold. The dynamic mold is mounted on the moving template of the injection molding machine, and the fixed mold is mounted on the fixed template of the injection molding machine. In the injection molding process, the dynamic mold and the fixed mold are closed to form a casting system and a cavity, and the dynamic mold and the fixed mold are separated when the mold is opened, and the plastic product is taken out. In order to reduce the heavy workload of mold design and manufacturing, most injection molds use standard formwork. If the shrinkage of the plastic article is greater than the elastic variables of the mold cavity and the core, there is no problem. But if it is small, the product will be sandwiched between the cavity and the core. If the injection pressure is high, the mold cavity wall is too weak, and the product wall thickness is small, the actual shrinkage of the product is small, and clamping occurs in this case.